Bowtie,
SB-100 will let you register any special construction car, not just a Cobra It will BE SMOG EXEMPT even if you have a 1,000 horse engine. You as the owner have the choice of registering it by body style year or engine year. Go with the 1965 body style as that was before emissions begin out here. All areas of the state are the same for SB-100. Your only big hurdle will be getting one of the 500 numbers per year that are alloted.
Goto the DMV site to get the steps.
www.dmv.ca.gov./vr/spcns/htm
To see what forms you need and print them out go to
www.cobratrader.com/registrationca.html
This will give you step by step procedures and even tell you which memo the DMV person will have at the DMV office to tell them how to do it in case they haven't done one.
Ron